Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 26, Issue 48, Pages 11039-11047Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202002115
Keywords
hole-transporting materials; perovskites; power conversion efficiency; solar cells; triazatruxene
Categories
Funding
- Swiss National Funds for Scientific Research [200020L172929/1]
- Spanish Ministry of Science, Innovation and Universities MCIU [CTQ2017-83531-R, PGC2018-099568-B-I00, RED2018-102815-T]
- Spanish Ministry of Science, Innovation and Universities MCIU (Centro de Excelencia Severo Ochoa) [SEV-2016-0686]
- Spanish Ministry of Science, Innovation and Universities MCIU (Unidad de Excelencia Maria de Maeztu) [CEX2019-000919-M]
- CAM (QUIMTRONIC-CM project) [Y2018/NMT-4783]
- Generalitat Valenciana [PROMETEO/2020/077, SEJI/2018/035]
- European Feder funds [PGC2018-099568-B-I00]
- MCIU [RyC-2017-23500]
- Universidad del Valle [CIAM-2017]
- Science, Technology and Innovation Fund-General Royalties System (FCTeI-SGR) [BPIN 2013000100007]
- European Union's Horizon 2020 research and innovation programme under the Marie Skodowska-Curie grant [754462]
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Three novel donor-pi-bridge-donor (D-pi-D) hole-transporting materials (HTMs) featuring triazatruxene electron-donating units bridged by different 3,4-ethylenedioxythiophene (EDOT) pi-conjugated linkers have been synthesized, characterized, and implemented in mesoporous perovskite solar cells (PSCs). The optoelectronic properties of the new dumbbell-shaped derivatives (DTTXs) are highly influenced by the chemical structure of the EDOT-based linker. Red-shifted absorption and emission and a stronger donor ability were observed in passing fromDTTX-1toDTTX-2due to the extended pi-conjugation.DTTX-3featured an intramolecular charge transfer between the external triazatruxene units and the azomethine-EDOT central scaffold, resulting in a more pronounced redshift. The three new derivatives have been tested in combination with the state-of-the-art triple-cation perovskite [(FAPbI(3))(0.87)(MAPbBr(3))(0.13)](0.92)[CsPbI3](0.08)in standard mesoporous PSCs. Remarkable power conversion efficiencies of 17.48 % and 18.30 % were measured forDTTX-1andDTTX-2, respectively, close to that measured for the benchmarking HTM spiro-OMeTAD (18.92 %), under 100 mA cm(-2)AM 1.5G solar illumination. PSCs withDTTX-3reached a PCE value of 12.68 %, which is attributed to the poorer film formation in comparison toDTTX-1andDTTX-2. These PCE values are in perfect agreement with the conductivity and hole mobility values determined for the new compounds and spiro-OMeTAD. Steady-state photoluminescence further confirmed the potential ofDTTX-1andDTTX-2for hole-transport applications as an alternative to spiro-OMeTAD.
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